#include<stdio.h>
#include<unistd.h>

int main()
{
    char* const argv[]={"ls","-a","-l",NULL};
    //execl("/usr/bin/ls","ls","-a","-l",NULL);
    //execlp("ls","ls","-a","-l",NULL);
    //execv("/usr/bin/ls",argv);
    //execvp("ls",argv); or execvp(argv[0],argv);
    

}
